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        <div onclick="document.getElementById('box').style.columnCount=2"
            style="width: 50px; text-align: center; line-height: 25px; background-color: #a3aaac47; margin-right: 5px;">
            2 列</div>
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            style="width: 50px; text-align: center; line-height: 25px; background-color: #a3aaac47; ">3 列</div>
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